<template>
  <!-- 商品分类导航 -->
  <div class="type-nav">
    <div class="container">
      <div @mouseenter="setShowNav" @mouseleave="setLeaveNav">
        <h2 class="all">全部商品分类</h2>
        <transition name="sort">
          <div class="sort" v-show="showNav">
            <div class="all-sort-list2" @click="goCurrent">
              <div
                class="item"
                v-for="(b1, index) in baseCategoryList"
                :key="b1.categoryId"
                @mouseover="setCurrentIndex(index)"
                :class="index == currentIndex ? 'active' : ''"
              >
                <h3 :data-category1Id="b1.categoryId">
                  <a :data-category1Id="b1.categoryId">{{ b1.categoryName }}</a>
                </h3>
                <div
                  class="item-list clearfix"
                  :style="{ display: index == currentIndex ? 'block' : 'none' }"
                >
                  <div class="subitem">
                    <dl
                      class="fore"
                      v-for="b2 in b1.categoryChild"
                      :key="b2.categoryId"
                    >
                      <dt :data-category2Id="b2.categoryId">
                        <a :data-category2Id="b2.categoryId">{{
                          b2.categoryName
                        }}</a>
                      </dt>
                      <dd>
                        <em
                          v-for="b3 in b2.categoryChild"
                          :key="b3.categoryId"
                          :data-category3Id="b3.categoryId"
                        >
                          <a :data-category3Id="b3.categoryId">{{
                            b3.categoryName
                          }}</a>
                        </em>
                      </dd>
                    </dl>
                  </div>
                </div>
              </div>
            </div>
          </div>
        </transition>
      </div>

      <nav class="nav">
        <a href="###">服装城</a>
        <a href="###">美妆馆</a>
        <a href="###">尚品汇超市</a>
        <a href="###">全球购</a>
        <a href="###">闪购</a>
        <a href="###">团购</a>
        <a href="###">有趣</a>
        <a href="###">秒杀</a>
      </nav>
    </div>
  </div>
</template>

<script>
import { mapState } from "vuex";
import { throttle } from "lodash";
export default {
  name: "TypeNav",
  data() {
    return {
      currentIndex: -1,
      showNav: true,
    };
  },
  methods: {
    setCurrentIndex: throttle(function (index) {
      this.currentIndex = index;
    }, 50),

    //商品搜索页面
    goCurrent() {
      let { category1id, category2id, category3id } = event.target.dataset;
      let query = {
        categoryName: event.target.innerText,
      };
      let params = {};
      if (category1id) {
        query.category1Id = category1id;
      } else if (category2id) {
        query.category2Id = category2id;
      } else if (category3id) {
        query.category3Id = category3id;
      } else {
        return;
      }
      if (this.$route.params) {
        params = this.$route.params;
      }
      this.$router.push({
        name: "search",
        query,
        params,
      });
    },
    setShowNav: throttle(function () {
      this.showNav = true;
    }, 50),
    setLeaveNav() {
      this.currentIndex = -1;
      if (!(this.$route.name == "home")) {
        this.showNav = false;
      }
    },
  },
  computed: {
    ...mapState("home", ["baseCategoryList"]),
  },
  mounted() {
    this.$store.dispatch("home/getCategoryList");
    if (!(this.$route.name == "home")) {
      this.showNav = false;
    }
  },
};
</script>

<style lang="less" scoped>
.type-nav {
  border-bottom: 2px solid #e1251b;
  a:hover,
  h2:hover {
    cursor: pointer;
  }
  .container {
    width: 1200px;
    margin: 0 auto;
    display: flex;
    position: relative;

    .all {
      width: 210px;
      height: 45px;
      background-color: #e1251b;
      line-height: 45px;
      text-align: center;
      color: #fff;
      font-size: 14px;
      font-weight: bold;
    }

    .nav {
      a {
        height: 45px;
        margin: 0 22px;
        line-height: 45px;
        font-size: 16px;
        color: #333;
      }
    }

    .sort {
      position: absolute;
      left: 0;
      top: 45px;
      width: 210px;
      height: 461px;
      position: absolute;
      background: #fafafa;
      z-index: 999;

      .all-sort-list2 {
        .item {
          h3 {
            line-height: 30px;
            font-size: 14px;
            font-weight: 400;
            overflow: hidden;
            padding: 0 20px;
            margin: 0;

            a {
              color: #333;
            }
          }

          .item-list {
            display: none;
            position: absolute;
            width: 734px;
            min-height: 460px;
            background: #f7f7f7;
            left: 210px;
            border: 1px solid #ddd;
            top: 0;
            z-index: 9999 !important;

            .subitem {
              float: left;
              width: 650px;
              padding: 0 4px 0 8px;

              dl {
                border-top: 1px solid #eee;
                padding: 6px 0;
                overflow: hidden;
                zoom: 1;

                &.fore {
                  border-top: 0;
                }

                dt {
                  float: left;
                  width: 54px;
                  line-height: 22px;
                  text-align: right;
                  padding: 3px 6px 0 0;
                  font-weight: 700;
                }

                dd {
                  float: left;
                  width: 415px;
                  padding: 3px 0 0;
                  overflow: hidden;

                  em {
                    float: left;
                    height: 14px;
                    line-height: 14px;
                    padding: 0 8px;
                    margin-top: 5px;
                    border-left: 1px solid #ccc;
                  }
                }
              }
            }
          }
        }
        .active {
          background: pink;
        }
      }
    }

    .sort-leave-active {
      animation: doms 0.1s linear reverse;
    }
    .sort-enter-active {
      animation: doms 0.1s linear;
    }
    @keyframes doms {
      from {
        height: 0px;
      }
      to {
        height: 461px;
      }
    }
  }
}
</style>
